Hi Mark,
The "horizontal line of stitching across the back panel" that you refer to secures the lower edge of the interior liner of the back panel. It was mandated on military holsters very late in 1918, too late to appear on WW1 military holsters, at least I've never come across one with this feature. It is a convenient way to date holsters, those with the line are post-war, as Klaus meant when he said "from the 1920th".
Regards, Norm
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